topic Re: HCS08 - Illegal BP - Random Cat noise in 8-bit Microcontrollers

HCS08 - Illegal BP

DanielMorley — Wed, 13 Dec 2006 07:15:21 GMT

I am trying to program a HC9SO8 chip with a C compiler

I add a while state and the device works for one pass only. The debugger tells me ILLegal BP and ends code.

I power down device and the code runs fine.

Code:

void main(void) {    int x; EnableInterrupts; /* enable interrupts */                 Initialize();  ConfigurePorts();    x=1;  while (x=1){     x=1;  if (Button1==DOWN){     Reverse();  }    } for(;;) {   __RESET_WATCHDOG(); /* feeds the dog */ } /* loop forever */ /* please make sure that you never leave main */}

(Alban: moved post from 16-bit; clear title; format code using SRC button)

Message Edited by Alban on 2006-12-12 11:26 PM

Re: HCS08 - Illegal BP

peg — Wed, 13 Dec 2006 19:19:49 GMT

Seems to me the dog may be getting hungry.

Re: HCS08 - Illegal BP

bigmac — Wed, 13 Dec 2006 23:20:19 GMT

Hello Daniel,

The following comments are additional to Peg's observation about the food deficit to the canine.

While not the cause of your illegal BP error, you will need to place the code that must execute multiple times within the "main loop" - within the loop forever block. Any code prior to this is normally intended to execute once only - except that your code seems to create another never-ending loop (assuming variable x remains at 1), and the following code will never be reached.

If you are sensing a mechanical pushbutton, you will also need to consider some de-bounce delay before re-testing the pushbutton state. Otherwise it would be possible for the reverse() function to execute multiple times for a single keypress, probably not what you intend.

Regards,

Mac

Re: HCS08 - Illegal BP

Sten — Thu, 14 Dec 2006 19:45:47 GMT

the "while (x=1)" (assignment instead of comparsion) will always be true and never exit.

Re: HCS08 - Illegal BP

Alban — Fri, 15 Dec 2006 05:52:20 GMT

As an improvement in future Designs, I suggest we replace the dog by a cat.

At least it will hunt for its food and we won't have to feed it.

This should save money...

Re: HCS08 - Illegal BP

rocco — Fri, 15 Dec 2006 06:35:58 GMT

It looks like Alban is spending his vacation on the board. And enjoying himself as well.

The problem with a cat is that it won't listen to you, and will reset the MCU when it darn well pleases.

Re: HCS08 - Illegal BP

yb — Fri, 15 Dec 2006 16:15:06 GMT

Hi,

I've found THE solution : using a dead cat... It doesn't need any feeds :smileywink:

Sorry....

Yvan

Message Edited by yb on 2006-12-1510:25 AM

Re: HCS08 - Illegal BP - Random Cat noise

Alban — Fri, 15 Dec 2006 19:48:45 GMT

Hi Rocco,

Daytime TV in the UK is .... undescribable. And so is the Scottish weather this week.

To bring a bit more on the innovation side:

I recognize I was carried away by the "kicking" and thought we should stop kick the dog and start kicking the cat who deserves it more.

But I also agree that the "ron-ron" of the cat would also create vibration on the board.and could also add to the EMC.

Alban.